Michel electron reconstruction using cosmic-ray data from the MicroBooNE LArTPC
Michel electron reconstruction using cosmic-ray data from the MicroBooNE LArTPC
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DOI：
10.1088/1748-0221/12/09/p09014
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发表时间：
2017-04
影响因子：
1.3
通讯作者：
M. C. R. Acciarri;C. Adams;Rui An;J. Anthony;J. Asaadi;M. Auger;L. Bagby;S. Balasubramanian
中科院分区：
文献类型：
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作者：
M. C. R. Acciarri;C. Adams;Rui An;J. Anthony;J. Asaadi;M. Auger;L. Bagby;S. Balasubramanian
自2015年以来，MicroBooNE液氩时间投影室（LArTPC）一直在费米实验室收集数据，除了中微子束，宇宙射线μ子。结果上的重建米歇尔电子产生的宇宙射线μ子的衰变在休息。TPC中大量产生Michel电子，并且鉴于其众所周知的能谱，可以用于研究MicroBooNE的探测器对低能电子（能量高达~ 50 MeV的电子）的响应。我们描述了开发用于重建米歇尔电子的全自动算法，使用该算法获得了约14，000个米歇尔电子候选者的样本。本文的大部分内容致力于研究米歇尔电子产生的辐射光子对其能量测量的准确性和分辨率的影响。在这个能量范围内，电离和韧致辐射光子的产生有助于类似的电子能量损失在氩气中，导致一个复杂的电子拓扑结构中的TPC。通过分析模拟重建算法的性能，我们表明，识别和包括由辐射光子沉积的能量的能力导致低能电子的能量测量的显着改善。当我们试图在重建中包括辐射光子时，我们测量的分数能量分辨率从超过30%提高到~ 20%。这些研究与大量的分析有关，这些分析旨在通过测量在宽能量范围内由νe相互作用产生的电子来研究中微子。
The MicroBooNE liquid argon time projection chamber (LArTPC) has been taking data at Fermilab since 2015 collecting, in addition to neutrino beam, cosmic-ray muons. Results are presented on the reconstruction of Michel electrons produced by the decay at rest of cosmic-ray muons. Michel electrons are abundantly produced in the TPC, and given their well known energy spectrum can be used to study MicroBooNE's detector response to low-energy electrons (electrons with energies up to ~ 50 MeV). We describe the fully-automated algorithm developed to reconstruct Michel electrons, with which a sample of ~ 14,000 Michel electron candidates is obtained. Most of this article is dedicated to studying the impact of radiative photons produced by Michel electrons on the accuracy and resolution of their energy measurement. In this energy range, ionization and bremsstrahlung photon production contribute similarly to electron energy loss in argon, leading to a complex electron topology in the TPC. By profiling the performance of the reconstruction algorithm on simulation we show that the ability to identify and include energy deposited by radiative photons leads to a significant improvement in the energy measurement of low-energy electrons. The fractional energy resolution we measure improves from over 30% to ~ 20% when we attempt to include radiative photons in the reconstruction. These studies are relevant to a large number of analyses which aim to study neutrinos by measuring electrons produced by νe interactions over a broad energy range.